Dictionary:Reduction to the pole (RTP)

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Removing the dependence of magnetic data on the magnetic inclination, i.e., converting data that have been recorded in the inclined Earth’s magnetic field to what they would have looked like if the magnetic field had been vertical. Reduction to the pole removes anomaly asymmetry caused by inclination and locates anomalies above the causative bodies, assuming that the remanent magnetism is small compared to the induced magnetism. It is difficult to do at low magnetic inclinations, in which case reduction to the equator is preferred.